Method for preparation of flexible self-support electrode with graphene as conductive binder and electrode

Abstract

The invention relates to a method for preparation of a flexible self-support electrode with graphene as a conductive binder and an electrode. The preparation method includes: firstly mixing a grapheneoxide solution with an electrode active material evenly to obtain a mixed slurry; then drying the mixed slurry to obtain a three-dimensional aerogel; then molding the three-dimensional aerogel; and then conducting high-temperature calcination under gas protection so as to obtain the flexible self-support electrode. Compared with the prior art, the method provided by the invention uses graphene toreplace the conductive agent, binder and current collector used in the traditional electrode, and acquires a good flexibility self-support electrode film, which can be applicable to a variety of active materials and solution systems, and has great application prospects in batteries, supercapacitors and other energy storage systems or other functional composite material fields.

Description

technical field [0001] The invention belongs to the technical field of electrochemical energy storage and composite material preparation, and relates to a method for preparing a flexible self-supporting electrode using graphene as a conductive binder and the electrode. Background technique [0002] Electrodes are crucial to the performance of energy storage devices. The active materials of traditional electrodes are basically in the form of powder or dispersed liquid. When preparing traditional electrodes, the active materials are mixed with conductive agents and binders to form a slurry and coated on On the current collector, an electrode can be formed. However, since the binder is a polymer, the presence of these polymer binders will affect the electronic conductivity and impair the electrochemical performance of the active material; the current collector usually requires the use of expensive metal thin films. Therefore, in traditional electrodes, the addition of conducti...

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Problems solved by technology

However, since the binder is a polymer, the presence of these polymer binders will affect the electronic conductivity and impair the electrochemical performance of the active material; the current collector usually requires the use of expensive metal thin films

Therefore, in traditional electrodes, the addition of conductive agents, binders, and current collectors will not only increase additional costs and damage the performance of active materials, but also occupy too much mass and volume, which greatly limits the energy density of energy storage devices.

In addition, these traditional electrodes prepared by the slurry coating method also have great deficiencies in flexibility, and it is difficult to meet the needs of wearable devices for flexible electrodes.

However, the existing flexible electrodes are usually prepared by loading nanoscale active materials on flexible conductive current collectors, which are expensive, difficult to produce and apply on a large scale, and are not compatible with commercial active materials such as graphite or lithium iron phosphate.

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